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2014-09-11T17:16:30+03:00
 \frac{17}{23} *x=92

17x=23*92
17x=2116
x= \frac{2116}{17}
 \frac{x}{x+1} *12=8
12x=8x+8
4x=8
x=2
 \frac{3x+1}{2x+5} *252=20

252(3x+1)=20(2x+5)
756x+252=40x+100
716x=-152
x=- \frac{152}{716} = \frac{76}{358}= \frac{38}{179}
 \frac{x}{3} *(x+1)=4
x(x+1)=3*4
x=3